wordpress query only sticky posts

// get sticky posts from DB
$sticky = get_option('sticky_posts');
// check if there are any
if (!empty($sticky)) {
    // optional: sort the newest IDs first
    rsort($sticky);
    // override the query
    $args = array(
        'post__in' => $sticky
    );
    query_posts($args);
    // the loop
    while (have_posts()) {
         the_post();
         // your code
    }
}